It is necessary to extract ignitable liquid residue from ˆre debris samples at scenes of arson using gasoline or kerosene as accelerants. Because extraction is essential for ˆre debris analysis and greatly in‰uences the composition of ignitable liquid residues, analysts have to understand the features of extraction methods and their proper conditions. To this purpose, we tested MonoTrap as an extraction method and then analyzed extracts by conducting gas chromatography mass spectrometry (GC/MS). We evaluated the eŠects of adsorption temperature, time, desorbing solvents, sample concentration, and the presence of water vapor on the composition of extracts. The result suggested that MonoTrap can be used successfully for forensic purposes and provided its proper conditions for extraction.
We investigated the burning properties of commonly used wooden panel ‰ooring, carpet on ‰ooring and styrofoam tatami, which were burned with liquid fuel gasoline or kerosene. We also conˆrmed how long detector tubes are able to detect ignitable liquid on the burnt ‰oorings. We obtained the following results:(1) At early stage of combustions, no distinct diŠerence in burning properties was observed between ‰ooring materials.(2) When the liquid fuel was spilled on the wooden panel ‰ooring, the liquid fuel moved underneath through the joints of the panels, therefore the fuel was easier to remain than other ‰oor materials.(3) The detector tubes were able to detect gasoline up to 4 weeks and kerosene up to 2 months after being extinguished.
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